RE: Shot gun silencer
Buy a NEF HandiRifle in 357 Mag and shoot 38 specials through it, or get a 44Mag NEF and shoot 44 special through it. These rifles are fairly cheap, and then you'd have a great plinker/carry gun/hunting rifle for another day.
I'd use heavy cast bullets and only take Heart/Lung shots out to about 75 yds.